Fern has set up a computer network for the entire building. Unfortunately, the signal strength diminishes as it reaches toward the computers away from the network source. Which devices should Fern employ to strengthen the signal?

signal repeaters.

Explanation:

The best device to use in this scenario would be signal repeaters. These basically grab an already existing signal and repeats it in a specific direction therefore amplifying the range. These devices are usually used when a large network system is not reaching certain devices that are located too far away. These devices are then placed in midpoints between the network and the device and aimed towards the direction of the device. It then picks up the existing signal and retransmits it to the devices' location so that the device can pick up the network signal and access it.